Upgrade to Backdrop 1.21.3
Upgrade to Backdrop 1.21.3

Update to 1.21.3

Here's the latest release info
https://github.com/backdrop/backdrop/releases/tag/1.21.3
https://github.com/backdrop-ops/backdrop-docker/commit/cb71efedce22392184d6d10aa67109e8f7e86725
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